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Data source
- Crossref[remove]20,933
- Web of Science (Lite)15,784
- Europe PubMed Central6,867
- PubMed6,704
- Manual2,429
- METADATA.UB1,489
- arXiv1,000
- OPENSCIENCE.UB996
- DBLP468
- MLA56
- RePEc43
- Google Books19
- CiNii EN9
- CiNii JP7